Iodide　salt　4　and　hexafluorophosphate　salt　5　of　1-methyl-2-ferrocenyl-3-ethylbenzimidazolium　are　prepared　using　2-ferrocenylbenzimidazole　2　as　starting　material.　2-[1＇-(2-Ferrocenylpropan-2-yl)ferrocen-1-yl]benzimidazole　(7)　is　obtained　by　the　reaction　of　formyl　2,2-diferrocenylpropane　with　o-diaminobenzene　in　the　condition　of　methanol　as　solvent,　reflux　and　catalysis　of　iodine.　Iodide　salt　9　and　hexafluorophosphate　salt　10　of　1-methyl-2-[1＇-(2-ferrocenylpropan-2-yl)-ferrocen-1-ly]-3-ethylbenzimidazolium　are　synthesized　using　7　as　starting　material.　Oxidative　potentials　of　ferrocenyl　connected　directly　to　benzimidazolium　in　these　salts　move　to　more　positive　position　to　a　large　extent.　Crystal　structure　of　4　is　explained　and　pi-pi　stacking　is　showed.　UV-Vis　spectra　shows　that　photoinduced　charge　transfer　exists　for　salts.　Iodide　salt　4　presents　good　catalytic　effect　on　decomposition　of　ammonium　perchlorate　(AP)　in　DSC-TG　(differential　scanning　calorimetry-　thermogravimetric)　test.